diff -r 000000000000 -r 6474c204b198 toolkit/components/search/tests/xpcshell/test_notifications.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/search/tests/xpcshell/test_notifications.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,84 @@
+/* Any copyright is dedicated to the Public Domain.
+ *    http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const Ci = Components.interfaces;
+
+Components.utils.import("resource://testing-common/httpd.js");
+
+let gTestLog = [];
+
+/**
+ * The order of notifications expected for this test is:
+ *  - engine-changed (while we're installing the engine, we modify it, which notifies - bug 606886)
+ *  - engine-added (engine was added to the store by the search service)
+ *   -> our search observer is called, which sets:
+ *    - .defaultEngine, triggering engine-default
+ *    - .currentEngine, triggering engine-current (after bug 493051 - for now the search service sets this after engine-added)
+ *   ...and then schedules a removal
+ *  - engine-loaded (the search service's observer is garanteed to fire first, which is what causes engine-added to fire)
+ *  - engine-removed (due to the removal schedule above)
+ */
+let expectedLog = [
+  "engine-changed", // XXX bug 606886
+  "engine-added",
+  "engine-default",
+  "engine-current",
+  "engine-loaded",
+  "engine-removed"
+];
+
+function search_observer(subject, topic, data) {
+  let engine = subject.QueryInterface(Ci.nsISearchEngine);
+  gTestLog.push(data + " for " + engine.name);
+
+  do_print("Observer: " + data + " for " + engine.name);
+
+  switch (data) {
+    case "engine-added":
+      let retrievedEngine = Services.search.getEngineByName("Test search engine");
+      do_check_eq(engine, retrievedEngine);
+      Services.search.defaultEngine = engine;
+      Services.search.currentEngine = engine;
+      do_execute_soon(function () {
+        Services.search.removeEngine(engine);
+      });
+      break;
+    case "engine-removed":
+      let engineNameOutput = " for Test search engine";
+      expectedLog = expectedLog.map(logLine => logLine + engineNameOutput);
+      do_print("expectedLog:\n" + expectedLog.join("\n"))
+      do_print("gTestLog:\n" + gTestLog.join("\n"))
+      for (let i = 0; i < expectedLog.length; i++) {
+        do_check_eq(gTestLog[i], expectedLog[i]);
+      }
+      do_check_eq(gTestLog.length, expectedLog.length);
+      do_test_finished();
+      break;
+  }
+}
+
+function run_test() {
+  removeMetadata();
+  updateAppInfo();
+
+  let httpServer = new HttpServer();
+  httpServer.start(-1);
+  httpServer.registerDirectory("/", do_get_cwd());
+
+  do_register_cleanup(function cleanup() {
+    httpServer.stop(function() {});
+    Services.obs.removeObserver(search_observer, "browser-search-engine-modified");
+  });
+
+  do_test_pending();
+
+  Services.obs.addObserver(search_observer, "browser-search-engine-modified", false);
+
+  Services.search.addEngine("http://localhost:" +
+                            httpServer.identity.primaryPort +
+                            "/data/engine.xml",
+                            Ci.nsISearchEngine.DATA_XML,
+                            null, false);
+}